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Class-9 Chapter-2 Is Matter Around Us Pure Part-1 Outline Video Lecture - Class 9

FAQs on Class-9 Chapter-2 Is Matter Around Us Pure Part-1 Outline Video Lecture - Class 9

1. What is the difference between a mixture and a pure substance?

Ans. A mixture is a combination of two or more substances that are physically combined and can be separated by physical methods, such as filtration or evaporation. On the other hand, a pure substance is made up of only one type of particle and cannot be separated into other substances by physical methods.

2. What are the different types of mixtures?

Ans. There are two types of mixtures: homogeneous mixtures and heterogeneous mixtures. Homogeneous mixtures have a uniform composition and appearance throughout, such as saltwater. Heterogeneous mixtures, on the other hand, have a non-uniform composition and appearance, such as a mixture of sand and water.

3. How can we separate a mixture of salt and water?

Ans. A mixture of salt and water can be separated by the process of evaporation. When the mixture is heated, the water evaporates, leaving behind the salt. The water vapor can be collected and condensed back into a liquid form.

4. What is meant by the term 'impurity'?

Ans. In the context of matter, an impurity refers to a substance that is present in a material or mixture in a small quantity and is not part of the desired or main substance. Impurities can affect the properties and purity of a substance and may need to be removed for specific applications.

5. How can we determine if a substance is pure or impure?

Ans. The purity of a substance can be determined by conducting various tests and experiments. Some common methods include measuring melting and boiling points, conducting chromatography tests, and analyzing the substance's chemical composition. A pure substance will have a specific and consistent set of properties, while impurities may cause variations or deviations.

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Sep 21, 2025 Last updated

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